John (disappointedly). Because it's pushed out of course. There's no sense in asking that sort of a question.
Daniel. Well, there's a flap on the bellows—a thing that moves up and down. Well, that flap has all to do with pushing the air.
John. Maybe this scientifican business is uninteresting to you, Sarah, is it?
Daniel (brightening up at the suggestion). I'm sure it is. Perhaps we better stop.
Sarah (smiling grimly). Oh, not at all. I want to hear more.
Mackenzie. You're wasting a lot of my time, Mr. Murray. I came here to hear about a fan bellows.
Daniel (confusedly). Oh, yes. Yes. Certainly. Fan bellows. There's a difference between a fan bellows and an ordinary bellows.
Mary (opening door from yard and coming in). Oh, Uncle Dan, are you explaining it to them. Did I miss much of it?
Mackenzie. I don't think it matters much what time you come in during this.
John (impatiently). Go on, Daniel.